Bpdb Previous Years Questions W

RECRUITMENT QUESTIONS OF

BANGLADESH POWER DEVELOPMENT BOARD (BPDB) FOR THE POSITION OF

ASSISTANT ENGINEERS

INDEX BPDB- 2011

--------------- 02

BPDB- 2004

--------------- 04

BPDB- 1999

--------------- 06

BPDB- 1998

(SET A)

------------ 08

BPDB- 1998

(SET B)

------------ 10

BPDB- 1996

--------------- 12

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l.a) Wrire dolvn rhc nameand poputationofthe SAARC countres. 5 b) How the lralficjam otDhaka cily canbe solved? Mcntionsyour suggestions. j . c) Wfite shortnoteon (anytwo) 5 Suescannel,Loadseeding,Greenhouseeff'ect. d) Wri!c down the full meaning of the follo\ing trbbreviations. 5 OPEC.CNC,SALT,UNICEF,NASA. { IOPEC-Organizalionof petrolium Eripo(ing Countries C\G=Compress Narural cas. SAlT=Srraregic Arms J i nildriunI rlksr L \lCFf-L nired \al.rn( Inl(or,ltron Children'sEmergencyFund,NASA=NarionalAeronaurjc andSpaceAdminsirarion.l C e) Nameoi lhc capiralofthe ibliowing counrries. 5 Myanmar,Labanon,Portugal.Morocco.ausLna. Labanon=Bairit,por gat=Lisbon JMayanmaFYangune, lvlorocco-Rabar, Austria=Bieana.l 2.a)$hat is thediilerenccbetlveeninverler& rectjficf? 2 b) Draw a lull wavebridgerectiiier? 5 (rc) Mcntion a device.which \lorks borh as reoritier and jnvener.Dralvtheblockdiagramofits principtet.l ".ofking d) What is amplil]er?Can a lransformer be usedas yollase 'r ,,r cun(nlrlnclifiertr-sti,))o,ir an.\\er. I.a)Whalis themainrheoryofoperaljonota transfotmer? 2

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l j e) A singlephaser.ansibrmefhas 400 primary llms and r 1000secondary turns.Ifthe prjnury windingbe connected ' to a j0H',, syslemand jf the peak value offlux densityin t l c c ^ r c0 . c ? o v b m . r n dc o . r . . d ( f i -lS he.ro.s.cclinn, areiofthe corl is 60cnrthefindouF j) lnd ccdvoltagcin the primarycnd. ri) inducedvoltagein the secondar], r.indings. 2+l arc the What dilterence be$een switch, isolalof and /i\4.a) gbfcaker'l l ql b) Name ibur types of circuit brcakersused in power r, _ sysrem. 2 c) Dra\{' a schenratic diagranr ofa 132/33KV doubte E bus .srrb.ldrionlrlinF tuo in.o.nrnrrg. rour u- gorr! kcderard a hLsiuupter 4 d) Whrrdo ) ou m(Jnby tJuttM\ A l r+

e) What is pcr'centage reactanccof a Dolversysrem?Sho$r h J 'h c o \ , K V \ r , t n . K \ r C I j t--,..o, i.d, r\ hJr.. I nf cd(n.c :,ppu,. a .' t.,isrur,o ",.f-,. " X oh and reaclanceY ohm, ficn ivhar should be the I'npedence of thatsyslem:) l-'2 b) Fromthe lbllowing diagramansweflhe question 2+2 thc currenli^D, ii) measurethevoltageVr^. , n1€?sure c) Supposesix barlefiesare conneclcdin thc ib owing way. hdividual ballery rating is 12 vott, t00AH (amtr. hour).Considcrthe uppcr seriesbatterybank is ..A.. and the ]o$,crsericsbatrerybankis "8" 2+2 i) Wlar is ihc totalvolrageofb:rtterybankA? 1i)\\,liat is the voltage& currenrmtingofiults]strlrlj d) Define:Load tactor,Planrfacror. --4*" 2+2 J ' W r , e r , - . r a l r r p o | | n J r D lle. no c - c \)t ( . r - . J b) Make a comparisonberq,een3,pha\c inou.uon and sysnchrounous molors. t9l l c) Discussthe causesofralio en.orandphaseangieerfof of a currenllmnsfbnncf. 4 d) Calculatcdre monrhl) bitl of a Lranstor]ncf \\hosc maximumdemandis i00KW ondloadiacror 10%.The 1ariffusedrs Ik :li, per KW and Tk. t.5 per Kw]r oonsumptron.,,1 l rr(.

Board PowerDevelopment Bangladesh

fbtAssisilnt Engineefs-1999 RecruimentExaminaljon EI crRlcAL LNGINEERING f1=\ M J r L "1 0 0 \ , : . 7 T n e r1 . 3 0h o u a \u | ' 'h rQuesrron que"rion' in Lrg i* rii*..,nf compursofyl ] a) Write in short, the implications of Bangabandhu Bridge over the econonicalaspects JanlunaMultrplLrpose 5 ofBangladesh. voltagc tlrc reasols .!nd remedics !f l-ow @ b) Nlenhon 5 probiemin polversectoi' hasbccomecharnpionin a Ibolball c) RecenllyBangladesh

2 (i) Whal is thenirne ofthc tournamenl? (ii) Whenrnd \\herethe toumanrenlwasPlayed? 3 d) Recentlymcmberuhjpof Pakisianhas becn suspcnded Organization' bv an lnlenatronal 1 olttre Organizaiion? [olc] name is the what 1i) (ii) \\rhy lhe menbershipwassuspended? . r , , ' ' i t - , . r g g e s l i o nh.o t B P I J Bc a ' r m o r n \ ( ils eftiolency and thereby render betler service 1o

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2. a) Nam. of.lhe dillorent conponentsol compurer ' 5 HardNalewilh theirfunctions. 'sollwares descfibes and computer fie of sone b) ^!ame u.e. ofcn) threeoi hen c) wha! is meantby E mail. Intemel'LAN, WAli Systenrs 5 usedin Computernct$ork slr'stem gfoup of Vector and percenlage impedance Explain 3. a) ?J oo*er lftnsibrmers. t) Dcscribenarallelopcl]rtionot transfoflnersslatin-qthe 1 condilions. 1 4. a) DescribeSF6cifcuii breaker' b) Oraw a 2l0KV two bus-bar syste showing thc S lnt, .\\,ne._ (i) Two generators(l50MW) each connecledthrough I 5.75/23oKVfansformers (ii) 4 oui going hres (iii) hvo 230/l32KV hansformcrs (iv) BusPT'S (v) CT'S (vi) lsolators 2 5. a) Why e.T andP T areLrsed? 2 T? ofa C poinl loliage knee by the you nrean Co Whxl bl + + P T 9 dia T Phase C diagnm ofa vector the Draw c)

d) Whal \\'ouldhappen.il \oLt li::: r;:. :,rr .:"i -:i ": \pl. ..rdcdr.l prnrcipLcs ol an 'l.ilem.ri!i.irenlronrr: $,od{rng 6.a) S1a1e corllponenls, rls majol E\iriainrh' b) Stalcihe condilionsol synchronizalirn rire'i!: : $lih Ahemaror 01'en ol s.vnchronjsiong m!,aning l: lbilo\\'ing 1lrcc ofthe any rots\ on shol1 7. Wdte (a) Y2K problern (b) SCADA Svsiem (c) Drr:c!'onal oler-currcrl relny. (dl RcveISe Power Relav (e)

BangladeshPower DevclopmentBoard RccruitnentExominatioir for Assislan!Engjneer-1998 ElcclricaiEnginccring SetA Time:2:10hou.s,FullMarl(s:100 Arswcr anysix qucstrors(Queslicniro.l is compulsory) l.(r) Dcscribcibc economicdlandsocialaslreclrof tsangladesh Bridge. 5 (b) lvlentionthe feasonandrclr1edies olsysien lossin po\\'efseclof. 5 (c) ln the lastworld cup Fooi Ball: 5 Who gerthegoldenb0ol'l liarnethe stadiumwh€feihe ilnal gane wasplaled? \\'ho wastherEf-erec in ihe finalnatch? (d) Name the localion , coLrntry and date of recent Nuclear explosions. Nlention world bodies re-action. 5 on lhe pfivateN\\,er generalion 6?1ei CN,e]ouf assessment 5 r.ii.\ now undcri]llplcncntationin Bangladcsh

2. (aj DiscussdiffereniFoteclionpro! idrd in *!e gcneratoragajnslvariousabnormalcondiliofls. 9 (b) What are primary and back-up prorectiofl: \l) ivii, up prolection is no1good subslitutEfor better rnainr.='!anc€-. 3. (a) whal is sequence nelwo.k?Discussail threeqpei;f sequence nelrorks? 9 (b) A thr€ephasetransmission lin€ operatingat l0 Kv and havinga resjstance ol l ohm andreactance of4 ohc66 is connected to the generating stationbus-barsthougha 5MVA step-uptransfbrmerhavinga reactance of5%, The bus-barsaresuppliedby a l0 MVA generator having10.,a reactance. Calculalethe shortckt KVA to symmerical .6 faultbet\\'eenphlsesin it occurs. j) allhe loadendoltransmjssionline ii) at thehigh voltagetcminal olthe transfonner. 4. (a) Makea comparison between3-phaseinductjonand .\ nchfonou\ molors i (b) Discussselfstartingof l-phasemolors. 5 (c) A 440V,3 plDsc,4-pole,50H2,37.3Kw' Yconnected induclionmotorhaslhe lbllowing paramelers. R1=0.1 ohm,Xr=0.4obn, R:=0.15ohm,Xr=0.44ohn. Themoror hasstatorcorelossof 1250w androtatiooallossof 1000W.11drawsa no loadline curenl of 20W alap.fof 0.09(lag).Whennotor operates at a slip of3tr,calcularei) inpul line currenlandp.f .) Flec ^ magrer..r^rqucde\ciopeJrl N.M | \ | ,u.p'flande fcrrncyafmoror 5. Writeshortnoteson any threeolthe followingr 15 a) BuchhilTrealy b) in\trumenttransfo.m(l c) Brushless excilalionssystem d) Push-pullarnplifiel' e) D.C tHnsmission 8 6. a) Discuss516 circuitBreaker bassystemshowingthe 0 b) Drawa 230KV n\-o:bLls iollowing (l50Mw) eachconnected i) Two generators throug!one 15.75l230KVtransfonner ii) 4 out golnglines iii) Two 230/132KVlransibrmers iv) BusPT's v) CT's 1 7. a) Explainthe basicpfinciplJoftap changlngofr uirilirm
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Banglad€shPower DevelopmentBoard

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will lake part in a World Cup competitionjn c) Bangladesh

2 (i) whal is the nameofthe game? 3 (ii) whcn and\r'herelhe gamewill be played? have countries and agencres olher and some C) USA on India & PakistandlLeto Nuclear imposedsanetalions 5 impacton Bangladesh? Describe its explosion. generaiion ptivate Power your on the assesment Give c) 5 in Bangladesh. policy nolv underimplem€nlalion a) Slate working principles of an Alternatof. 2. 5 Mentioningits majorcomponents. amoungSquirelCageDC & Slipring b) Make comparision 5 moton givingat leastoneapplicationlbr each. Explain the c) Slaie the conditi{rnof sysnchronization. 5 ofan altemarorwith bus. mcaningof synchronizing percentage and Vector impodance a) Explain J Aroupoi 4 po\4erlransformefs. 'staiing ihe iransfomers paraliel of operation b) Describe condirors. 6 c) Illushaleanythreeofthe lbllowingrransfornef: i) hstrument ii) Aulo iii) Distribulion r\| \.4rr(nrng\,Uroundrng. 4 4. a) N.rne thc larioustypcsolcircuil b&aker' and batteries and r\"ickel-cadmiurn load-acid Dcscribe b) 6 baftery charyingsystem. works c) Describehow a powerline caffiercommunication 5 andwhalarc ils essenlialconrponenls. j.6) Wha! are difibrenccsbetqeen a cunent transibrner 5 andpoteDlialtl?nsl'onneri b) Draw phasediagram of a potentialiranslbmer and riiscussthc casuesofralio enor & phascangle€rror' l0 6a) Siale ]e beneilts which are divided frorn tlrc appiicrlionoi shrrn!capaciloron the lord end ol a circuit 9 s pplyirlg3 ioadDflaggingPowerthclor' and capaciior shunl conpafision between :r b) Dralv in respec!oflheit applicrniionsrn condenson s.rnchronous 6 powersls!,fl. 15 ofthe follow'ng:any three shoft notes on 7. Witc (b) Directionalo\er cunentrelay. (a)Transducer (c) Lighlingan$tor. (d) Rev€fsePowerRelr, (e) Gasiu.binepowcrPlant. . ,

BangladeshPowerDevelopmentBoard RecruilmentExaminalionfor AssistantEnginecr_1996 ElecldcalEngineering - Tinei 2:30hours,Full Marks:100 Answerany six questions(Questionno.8js compulsory) and l.(a) Make a compafisonbciweensytrchronous i0 inductionmotor!. ofa (b) Enumr:rare endexplajnat leastt1!oapplications 5 molof svnchronous po*er and ihctof oI lo* 2. (a) \1hataretha disadvantages 1 what arcthe wa]'sto correctit. a load fioln (b) A f'aclorylakcsihc followingbalanc€d 440Y,3{hase, 50 HZ suppiyi i) a lightingloadof2oKw InolorlodJ.l joKVA a'0 5 Pflugp'ng 0./a Jo'ltinLoL.s Calculatethe KVA rattngollh€ €apacitorbankrequlfedlo iniprovelbe powerI-actotofloads (a) and(b) togelh€rto unhy. \lilat is the new ovemllPl ifafier correcllonias ii beenapplied;the weldingloadls switchedon

,r.(a) f,hat arethe dilIi,fc.l bclwecna cunenttransfonner ilr'.r ^ r(' Jd:Tor (b) Drns phasordiagranofa potentialtnnsl'onn.:rand discussthc causesolratio errorandphascanglecrror. l0 .1.(3)E\!laindreirin.ipleofopemtionoid lhrccphasc po*cr lfunsiorrner. 3 lb) Assrmingrhairlvorranslbnnerhavingunequalralios ln)w is paralleled,-indicalc ol ir?niloFnxtio.a.e conlrected 4 ihe 1or:lloaddi\ idesber$eenlhem. t!) \\}3! shouldbethe KVA ratingofeachlfanslbFncris Nhenths Lh!ccphdscbalanced,loa.iis 4{J ! \'-\ ba|rl.i fol I\\ \l If a thifd sinilaf lfanslbnncris connected what is th€ mted.apacit)? Wtat rir:r'!lion in delta-deha. p.rcenrrgeincfeaseis ratnrgis efiectedin thisway? 8 diUcrcnlkird olgenefation ,<.ra)Gi,je.rbricl descriplion in BI'llB systen. t ow canwc rcduc. rbl Whatis demandsideof manage'nent. generarjon 5 shodlallbyadoptingsuchmanrg.mcnt? 6. Wire slrortnoteon anythreeof drefbljowxrg: 3 alTrunsmisslonljrreproleciion l b) Reveneposcr rcl3y 3 c) SF6cifcuil brcaker 'i i C)Gas urbin! Pollcr PIarrL l respecto1rcctiUcfoutlrul. cl Ripplef-acro. l. (r) Statethe benefils$hich arc dcri\cd lioDrthc lrlpiicationofshunl oapaciloron lhc loadend.)1a circuit supplyinga loadoflaggingpo\lcr l'aclor. | . n ' r ' \ J o nD . J r 'I ' J L(JU , . h . \ ' f : r c , . - a n i " in fcspiot oftlrcir applcatron slnchronolrscondenser 6 po\ler sysienr. \ , d , \ \ ' , , e . l , r ' . \ : . r , ' l j " : . r . . ( r r ' r o , r r : c f , ro ' i l 5 powcfgcncialionin llangladesh". Ioss in an eleclricity LLiilily ir) lvhrL ar c ca|scs ofs),stem t :' rol'r r)r i. "nru "januna mullipLrposc Eridgc \\rritc shortnole on icl Lulr' . ill i) \.ha! do lou n,eanb) soli\rafea'rd Hard{arc"ln ,. r,pL,jr. iil what ls ' Bio Gas"'lWhalareils,ionsLilucnls? 5 felaiiveposili;n oilhc sun, ii) Whatis "galirxy"l State.th€ . r r . J . r r r o . . - n Lr h . i | , J . i o n i , e..rr\ !1